Thanks burn - as I said before I've looked around and can get the SKB much cheaper than I can get the hardcases, so I'll just set my sights on those and work out what will work for my drums.
Thanks deathmetal, I've seen the measurements on the SKB site, just need to find the outer dimensions of the saturns somewhere, not having much luck there but I'll persist.
As a side note I've been thinking about RIMS mounting my sonors and getting a cradle for the 14" so that means they'll also need oversized cases... my sonor bass is a 22 so if what I think I know about saturns is correct then 10, 12, 14, 16, 22 cases will work with both my kits.